The ejection of triatomic molecular hydrogen ions h-3(+) produced by the interaction of benzene molecules with ultrafast laser pulses

S. Kaziannis, I. Liontos, G. Karras, C. Corsi, M. Bellini, C. Kosmidis

Research output: Contribution to journalArticle

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Abstract

The ejection process of triatomic molecular hydrogen ions produced by the interaction of benzene with ultrafast laser pulses of moderate strong intensity ( ∼ 1014 W/cm2) is studied by means of TOF mass spectrometry. The H3+ formation can only take place through the rupture of two C-H bonds and the migration of hydrogen atoms within the molecular structure. The H3+ fragments are released with high kinetic energy (typically 2-8 eV) and at laser intensities ≥ 1014 W/cm2, well above that required for the double ionization of benzene, suggesting that its formation is taking place within multiply charged parent ions. The relative ejection efficiency of H3+ molecular hydrogen ions with respect to the atomic ones is found to be strongly decreasing as a function of the laser intensity and pulse duration (67-25 fs). It is concluded that the H3+ formation is only feasible within parent molecular precursors of relatively low charged states and before significant elongation of their structure takes place, while the higher multiply charged molecular ions preferentially dissociate into H+ ions. The ejection of H2+ ions is also discussed in comparison to the production of H3+ and H+ ions. Finally, by recording the mass spectra of two deuterium label isotopes of benzene (1,2-C6H4D2, 1,4-C6H4D2) it is verified that the ejection efficiency of some molecular fragments, such as D2H+, DH+, is dependent on the specific position of hydrogen atoms in the molecular skeleton prior dissociation.
LanguageEnglish
JournalJournal of Chemical Physics
Volume131
Issue number14
DOIs
Publication statusPublished - 14 Oct 2009

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Ultrafast lasers
hydrogen ions
Benzene
molecular ions
ejection
Protons
Laser pulses
benzene
Ions
Molecules
pulses
lasers
molecules
hydrogen atoms
ions
fragments
interactions
Hydrogen
Atoms
musculoskeletal system

Keywords

  • triatomic
  • molecular hydrogen
  • ions h-3(+)
  • benzene molecules
  • ultrafast laser pulses

Cite this

Kaziannis, S. ; Liontos, I. ; Karras, G. ; Corsi, C. ; Bellini, M. ; Kosmidis, C. / The ejection of triatomic molecular hydrogen ions h-3(+) produced by the interaction of benzene molecules with ultrafast laser pulses. In: Journal of Chemical Physics. 2009 ; Vol. 131, No. 14.
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The ejection of triatomic molecular hydrogen ions h-3(+) produced by the interaction of benzene molecules with ultrafast laser pulses. / Kaziannis, S.; Liontos, I.; Karras, G.; Corsi, C.; Bellini, M.; Kosmidis, C.

In: Journal of Chemical Physics, Vol. 131, No. 14, 14.10.2009.

Research output: Contribution to journalArticle

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T1 - The ejection of triatomic molecular hydrogen ions h-3(+) produced by the interaction of benzene molecules with ultrafast laser pulses

AU - Kaziannis, S.

AU - Liontos, I.

AU - Karras, G.

AU - Corsi, C.

AU - Bellini, M.

AU - Kosmidis, C.

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N2 - The ejection process of triatomic molecular hydrogen ions produced by the interaction of benzene with ultrafast laser pulses of moderate strong intensity ( ∼ 1014 W/cm2) is studied by means of TOF mass spectrometry. The H3+ formation can only take place through the rupture of two C-H bonds and the migration of hydrogen atoms within the molecular structure. The H3+ fragments are released with high kinetic energy (typically 2-8 eV) and at laser intensities ≥ 1014 W/cm2, well above that required for the double ionization of benzene, suggesting that its formation is taking place within multiply charged parent ions. The relative ejection efficiency of H3+ molecular hydrogen ions with respect to the atomic ones is found to be strongly decreasing as a function of the laser intensity and pulse duration (67-25 fs). It is concluded that the H3+ formation is only feasible within parent molecular precursors of relatively low charged states and before significant elongation of their structure takes place, while the higher multiply charged molecular ions preferentially dissociate into H+ ions. The ejection of H2+ ions is also discussed in comparison to the production of H3+ and H+ ions. Finally, by recording the mass spectra of two deuterium label isotopes of benzene (1,2-C6H4D2, 1,4-C6H4D2) it is verified that the ejection efficiency of some molecular fragments, such as D2H+, DH+, is dependent on the specific position of hydrogen atoms in the molecular skeleton prior dissociation.

AB - The ejection process of triatomic molecular hydrogen ions produced by the interaction of benzene with ultrafast laser pulses of moderate strong intensity ( ∼ 1014 W/cm2) is studied by means of TOF mass spectrometry. The H3+ formation can only take place through the rupture of two C-H bonds and the migration of hydrogen atoms within the molecular structure. The H3+ fragments are released with high kinetic energy (typically 2-8 eV) and at laser intensities ≥ 1014 W/cm2, well above that required for the double ionization of benzene, suggesting that its formation is taking place within multiply charged parent ions. The relative ejection efficiency of H3+ molecular hydrogen ions with respect to the atomic ones is found to be strongly decreasing as a function of the laser intensity and pulse duration (67-25 fs). It is concluded that the H3+ formation is only feasible within parent molecular precursors of relatively low charged states and before significant elongation of their structure takes place, while the higher multiply charged molecular ions preferentially dissociate into H+ ions. The ejection of H2+ ions is also discussed in comparison to the production of H3+ and H+ ions. Finally, by recording the mass spectra of two deuterium label isotopes of benzene (1,2-C6H4D2, 1,4-C6H4D2) it is verified that the ejection efficiency of some molecular fragments, such as D2H+, DH+, is dependent on the specific position of hydrogen atoms in the molecular skeleton prior dissociation.

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